Home Postcode finder SA Monarto South Monarto South postcode SA Monarto South is a locality in South Australia covered by postcode 5254. Postcode 5254 State or territory South Australia (SA) Region Sa Subs Near 2 Add a free Monarto South business listing Be the first listing in Monarto South Common questionsWhat is the postcode for Monarto South?Monarto South, SA has the postcode 5254.What state is Monarto South in?Monarto South is in South Australia (SA).Does postcode 5254 cover more than one suburb?Yes. Postcode 5254 covers 12 localities, so the postcode alone does not identify Monarto South. Browse other postcodes in South Australia, or widen the search to every Australian postcode.